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GRATE. APPLICATION FILED 111cm, 1905.

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No. V831,311.2.

F. G. HEATH.

GRATB. APPLoATIoN FILED AUG. a, 1905.

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F. C. HEATH.

GRATE. APPLICATION FILED AUG.3,1905.

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PATENTED SEPT.. 18, 1906.

F. C. HEATH.

GRATE. -APPLIGATION FILED AUGJd, 1905.

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PATENT oEEroE.

FRANK C. HEATH, OF REVERE, MASSACHUSETTS.

GRATE.

Specification of Letters Patent.

Patented Sept. 18, 1906.

Application filed August 3. 1905. Serial No. 272,532.

To @ZZ wwnt t 7a2/ay concern:

Be it known that 1, FRANK C. HEATH, of Revere, in the county of Suffolkand State of Massachusetts, have invented certain new and usefulImprovements in Grates, of which the following is a specification.

This invention relates to shaking-grates of the type which has aplurality of bars movable longitudinally to break up the ashes andclinkers and separate the ash from the coal and its objects are tofurnish -such grates with provisions by Which they may resist injuryfrom the heat of the fire, to prevent the moving parts becoming cloggedby the ash, to gain as large a proportion of air-space as is possibleconsistently with strength, to secure the maximum strength with theminimum weight, and to make the parts reversible, interchangeable,adjustable, and incapable of being injured by unskilled and incompetenthands.

Accordingly the invention consists in a grate having the improveddetails of construction which T will now proceed to describe and claimand which are illustrated in the drawings, forming a part of thisspecification, in which- Figure 1 represents a plan view of an improvedgrate constructed in accordance with my present invention. F ig` 2represents a vertical longitudinal section of the same, taken on line 22 of Fig. 1. Fig. 3 represents a plan of the operating mechanism forshaking the grate-bars, the bars being removed. Fig. 4 represents a planview of the under side of one of thereciprocable gratebars. Fig. 5represents a side elevation of a detail of the operating mechanism. Fig.6 represents an elevation of one of the rockshafts. Fig. 7 represents aperspective View of the grate, parts being removed. Figs. 8 and 9represent a plan and an elevation, respectively, of a grate-bar havingdetachable sections. Figs. 10 and 11 represent an under plan and anelevation, respectively, of one of the detachable grate-bar sections.Fig. 12 represents a cross-section of one oi the grate-bars. Fig. 13represents a crosssection on line 13 13 of Fig. 8.

The same reference characters indicate the same parts in all thefigures.

The supporting-framework for the grate consists of end bars 1 and sidebars 2, which may be supported by any suitable desired means in afire-box or furnace inclosure. The sidey bars 2 support rock-shafts 3 4,

which are symmetrically mounted adjacent the ends of the grate-frame,each rock-shaft being separated from the adjacent end of the grate bythe same distance as the other. The rock-shafts rest upon the side barsand are held in proper relation thereto by depending projections 5 onthe shaft straddling the bars and studs 6, arranged in pairs on the sidebars, each pair embracing one of the projections 5. Extending downwardfrom the rock-shaft 4 is an arm 7, which carries a double socket 8,adapted to receive the end of a shaker-bar 9, which may be detachablyset in either end of the socket, so as. to project either forward orrearward,

Where it may be manually engaged and operated to oscillate therock-shaft.

A connecting-rod 10 is detachably engaged with the arm 7 and with an arm11, projecting upwardly from the rock-shaft 3, whereby when shaft-4 isoscillated shaft 3 is simultaneously rocked in the contrary directions.The connecting-rod is detachably engaged with the respective arms of therock-shafts by means of headed studs or buttons 12 13, respectively, theheads of which are elongated, having one dimension substantially thesame as the diameter of the shank of the stud and the other dimensionconsiderably greater. rod has slots 14 in its ends shapedcorrespondingly to the heads of the studs, so as to slip thereover andwhen turned so that the slots are inclined to the heads are held therebyon the studs. The slots and studheads are so arranged that when theconnecting-rod and rock-shafts occupy their normal positions the headsare inclined relatively to the slots to prevent accidental detachment ofthe connecting-rod. The rock-shaft 3 also has a downwardly-extending arm15 and shaft 4, an upward arm 16 being provided with similar studs, sothat the points of attachment of the connecting-rod to the rock-shaftsmay be reversed in case one of the studs or arms of either rock-shaftshould break or whenever such reversal may be necessary or desirable.

Each of the rook-shafts is provided with upstanding projections ortongues 17 and 18,

The connectingj lOC IOSI

respectively, these projections being equally h IIO grate-bars 20, andto turn therein. The bars 20 are arranged longitudinally of the grateparallel to the side bars 2, and each is engaged with one of theprojections on one of the rock-shafts, alternating bars being connectedat corresponding ends with the projections 17 and the intermediate barsbeing correspondingly connected at the other ends with the projections18. rock-shafts are oscillated in the manner above described thegrate-bars 2O are reciprocated in the direction of their length, eachbar moving in the opposite direction from that taken by its neighbor.

Each of the projections 17 18 on the rockshafts is flanked on each sideby supporting flanges 21 22, respectively, the surfaces of which aresegments of circles concentric with the axes of therockers which engagethe under surfaces of the grate-bars on both sides of the sockets 19 andsupport one end of each of the bars, the other ends being supported byroller-rods 23 24, resting on portions 25 26 of the side bars which formtracks.

The sockets 19 extend upwardly into the grate-bars, partially but notentirely through the same, the upper surfaces of the bars extendinguninterruptedly over the sockets and closing their upper ends. They arealso inclosed on all sides except at the bottom, so that there is noopportunity for ash to get into the sockets and obstruct and hinder theoperation of the tongues 17 18. Grates of this` general character havebeen hitherto made in which the attachment between the movable bars andthe rocking members are exposed, so as to permit ashes and bits of coalto work between them and so prevent their proper action; but this resultis wholly avoided by the construction above described.

The longitudinally-movable bars 2O have fingers 27 extending from theirends in the direction of their lengths, and these ngers project betweencomplemental fingers 28, formed laterallyupon transverse corrugatedheader-bars 29, arranged at the ends of the furnace inclosureperpendicular to,the bars 20. The fingers 28 of these bars are separatedfrom each other by spaces 30, which extend entirely across the barsthroughout their whole width, and thus leave no obstructing shoulders inline with the ends of the fingers 27, where ash can collect and obstructthe motion of the movable bars. The bars 29 are duplicates of eachother, so that they may be interchanged, and so, also, are the bars20videntical with each other and interchangeable, and each of theselast-named bars has two sockets 19, which fits it to be engaged witheither rock-shaft, whereby any of the bars may occupy a position at anypart of the grate or may be turned end for end,

The end grateebars or headers 29 are formed with longitudinal webs 3 1to which the fingers 28 are attached, and the movable bars 2O alsoThereby when the have their under parts formed as webs 32, extendingdownward from the central ribs of these bars and varying in depth toform an inverted arch. These webs 31 and 32 are corrugated transverselyof their length, forming perpendicular arches or flutings which permitthe bars to expand and contract longitudinally without breaking orinjuring the webs.

The bars 20 are constructed, as usual, with lateral fingers 33projecting perpendicularly from the central rib, those on one side beingintermediate those on the other side of the rib and also being arrangedto extend outward from the crowns of the perpendicular arches, one lugprojecting from each crown. As the crowns on one side of the rib aredepressions on the other, this gives the staggered arrangement of thelugs. One of the novel improvements of this invention consists ingrooving the tops of bars 20, making the central portions 34longitudinally depressed and forming lateral concavities 35, extendingalong the tops of the fingers 33. These grooves are shallow, beingslight depressions in the fuel-supporting surfaces of the bars, andserve to permit fine ash to collect on the surfaces beneath the bed ofhot fuel, which acts as a non-conducting blanket and prevents burning ofthe bars and fingers, also preventing slag or clinkers from burning ontothe surface of the iron. These grooves also form rough uneven surfaces,whichwhen agitated sift the ashes and clear the grates of ashes andclinkers more quickly.

As the lateral fingers of each of the gratebars project toward those ofthe adjacent bars, there is danger that the fingers might become engagedand interlocked with each other in case the bars 2O should becomedisplaced or warped, and in order to guard against such a contingency Iprovide on each side of the bars at their central portions spacingprojections 36, which are practically of equal length or 'area andextend laterally from the central portions of the bars a greaterdistance than do the fingers, so that the outer sides of theseprojections are extended beyond the ends of the fingers. Owing to thesymmetrical construction of the bars 20, these projections on adjacentbars are arranged side by side, and they extend in the direction of thelength of the bars a greater distance than the amplitude of vibration oramount of travel of the bars when the grate is shaken, so that theynever pass by each TOO other, but are always arranged so as partially tooverlap. Therefore if a bar should become warped or displaced thespacing projections would be the only parts to come into contact withthe adjacent bars, and they would prevent the fingers from becomingcaught. The outer sides 37 of these spacing projections are corrugated,so as to break up the ash and clinker when the bars are reciprocated andalso to provide air-passages. There are also provided air-passages 38between the central ribs of the bars and the outer portions yof theseprojections. By making the two projections 36 of each bar substantiallyequal in length or area and opposite each other a bar cannot be soplaced in position as to interfere with the described functions of saidprojections.

Each grate-bar may be made of one piece, the webbed fuel-supportingsurface and fingers being integral; but I prefer to make these bars withthe fuel-supporting portions detachable and removable, so that wheneverone part becomes burned out or distorted it can be removed and anothersubstituted without requiring the substitution of an entire new bar.Figs. 8 and 9 show the construction of a bar as a whole when fitted withthe detachable supporting-sections, and Figs. lO and 11 show one of thesections detached. The detachable sections consist of short pieces 39,each of which has a few fingers 33 projecting from opposite sides andarranged so that the fingers on one side are directly opposite thespaces between the fingers on the other side, and on the under side ofthese sections are formed depending lugs 40, which are also given astaggered arrangement and are adapted to embrace the web 32 when thesections are applied to the bar, the lugs being then placed in thedepressions formed on opposite sides of the web by the corrugations. Thearrangement of fingers and lugs is such that when the sections are inplace the fingers project on each side from the crowns of thecorrugations. The web also has lateral lugs 41 integrally formedthereon, which are arranged similarly to fingers 33 and act to supportthe latter when the removable sections are in place. These lastnamedlugs are covered by the fingers, and so are protected from injury by thefire.

All of the members, of which there are two or more in the grate, areduplicates. In other words, the headers are exactly alike, the bars areexactly alike, and so, also, the two rock-shafts and the tworoller-rods. This not only reduces the cost of making by requiring theleast possible variety of patterns for the castings, but it simplifiesthe matter of assembling to such an extent that a most inexperiencedperson would have diciculty in getting the parts misplaced. Forinstance, the grate-bars can be placed in position with either end atthe front of the grate, and. no difference in their functions oroperations can result. Moreover, but a small stock of renewable partsneed be kept on hand to replace damaged members.

l. A shaking-grate comprising a series of duplicate bars placed side byside and movable freely endwise, their fuel-supporting surfaces beingalways in one plane, each bar consisting of a longitudinalvertically-corrugated web and lateral separated fingers extending fromopposite sides thereof, the corrugations of the web permitting expansionand contraction of .the bar without injury to the web g duplicateheaders at the ends, and two pairs of duplicate movable supports for theend portions of the bars whereby the latter are permitted to elongateand shorten freely.

Y 2. A shaking-grate comprising a headerbar at each end the headersbeing duplicates and each being formed of a verticallycorrugated web andtransverse fuel-holding fingers entirely separate from each other, thespaces between the fingers and the corrugated webs permitting freelongitudinal expansion and contraction of the headers duplicatelongitudinal grate-bars having lateral fuel-supporting fingers in thesame plane with each other and with the surfaces of the headers andlongitudinal fingers at their ends projecting' between the fingers ofthe headers and duplicate rockers and rollers supporting thelongitudinal bars. adjacent their ends, the bars having longitudinalribs vertically corrugated to permit elongation and contraction withoutfracture thereof, and the rollers permitting such elongation andcontraction to take place freely.

3. A grate comprising a plurality of longitudinally-reciprocable bars,each having a longitudinal stiffening-web on its under side, the webbeing of uniform thickness up and down and tapered in depth from centerto ends, and transversely corrugated uniformly from top to bottom of theweb to provide alternate rounded projections and depressions, thedepressions on one side being opposite the projections on the other,whereby longitudinal expansion and contraction is permitted, and thebars having lateral fingers oppositely and alternately varranged toextend outward from the projections.

4. A grate comprising a series of bars having fuel-supporting surfacesmovable longitudinally and oppositely in one plane and adapted tosupport fuel over their entire lengths; rock-shafts adjacent the ends ofthe grate, each having projecting segmental surfaces adapted to supportone end of every other bar, the bars having sockets in their under sidescovered above by the fuel-supporting surfaces and inclosed by the sidesof vthe bars; said rock-shafts having tongues projecting from thesegmental surfaces lying within the sockets, whereby oscillation of therock-shafts is adapted to reciprocate the bars.

5. A grate comprising a series of bars having fuel-supporting surfacesmovable longitudinally and oppositely in one plane and adapted tosupport fuel over their entire lengths; rock-shafts adjacent the ends ofthe grate and having projections extending there- IIO from, eachconsisting of a tongue and segmental surfaces close to and on oppositesides of the tongue, one end of each alternate gratebar resting on asegmental surface; and the bars having downwardly-opening socketscovered above by the fuel-supporting surfaces and inclosed on all sides,receiving the tongues, whereby oscillation of the rocl shafts is adaptedto reciprocate the bars.

6. A grate comprising a frame; rock-shafts supported thereon, armsextending upwardly and downwardly from each rock-shaft, each armprovided with a stud having a shank and an elongated head, aconnecting-rod having slots corresponding in outline to the heads andengaged with the studs of the upwardlyextending arm of one rock-shaftand the downwardly-extending arm of the other, said connecting-rod beingalso adapted to be engaged with the studs on the downward arm of thefirst rock-shaft and the upward arm of the second, and a plurality ofendwise-movable grate-bars each engaged with one of said rock-shafts formovement thereby in opposite directions.,

7. A grate comprising a frame; a rocker and a roller mounted, adjacenteach end of the frame; said rockers having projections each consistingof a tongue and segmental flanges on opposite sides thereof, saidprojections being spaced apart and those of one rocker situated oppositethe spaces of the other rocker j. grate-bars each resting near one endon the segmental flanges of one of said projections and near the otherend passing between the projections of the other rocker and resting onthe adjacent roller, the bars having downwardly-opening, but otherwiseentirely inclosed, sockets receiving the tongues, one tongue being thusengaged with each bar; and connections for causing the rockers to beoscillated simultaneously in opposite directions, whereby adjacent barsare reciprocated oppositely. j

8. A grate comprising parallel, movable fuel-supporting bars, mechanismfor oppositely-reciprocating alternate bars in the direction of theirlengths, said bars having iingers projecting laterally toward theadjacent bars and also spacing projections extending laterally beyondthe ends of the fingers, the said projections of each bar beingsubstantially equal in length or area and located beside those of theadjacent bars and extending longitudinally of the lbars a greaterdistance than the amplitude of vibration thereof, said -projectionsbeing also grooved or corrugated vertically on their outer sides.

9, Agrate comprising supports, a plurality of bars each mounted on saidsupports with their fuel-supporting surfaces in one plane so as to bemovable longitudinally in said plane, each bar consisting of a centralweb of substantially equal thickness from top to bottom and verticallycorrugated to form alternate rounded protuberances on each side thereof,and ngers projecting laterally on opposite sides of the bar from saidprotuberances, spaces being left between the iingers opposite thedepressions, the bars being longitudinally and centrally grooved and thefingers being grooved on their upper surfaces.

10. A grate comprising a plurality of duplicatelongitudinally-reciprocable bars, each consisting of a central webhaving vertical corrugations forming alternate rounded pro jections anddepressions on opposite sides thereof, each depression on one side beingopposite a projection on the other side, detachable fuel-supportingsections mounted on said web and having laterally-projecting fingers onopposite sides out of alinement, and lugs depending from the saidsections and arranged to slide in the depressions in opposite sides ofthe web and being wholly clear of the projections, the said fingersbeing directly above the alternate projections of the web.

In testimony whereof I have a'HiXed my signature in presence of twowitnesses.

FRANK C. HEATH.

Witnessesc.

ARTHUR H. BROWN, A. C. RATIGAN.

